Two boys and a microraptor. A dark, mysterious forest. And a squad of army-trained mercenaries searching for them. What could possibly go wrong?

Falling behind their classmates on a school trip to the Alps, Finn and Milo stumble upon an egg buried in ice. Later that night it hatches, and a 65-million-year-old baby is born. Arty is a microraptor brought back from extinction. But keeping her safe proves harder. Wicked scientists will do anything to get their hands on her, and soon Finn and Milo must run for their lives ...